. >> law enforcement hone in on two towns -- 7:20 a.m. in cambridge, police search a home where they believe the two brothers lived. >> and in watertown, the last place where the last suspect was seen, police recovered 200 spent rounds. evidence that homemade bombs and a pressure cooker. but no evidence of the suspect. the typically tranquil boston suburb is swarming with s.w.a.t. teams. military units searching house to house. while residents look out their windows at the surreal sight. >> yeah. he is in our garage right now. >> we've had s.w.a.t. teams police patrolling the neighborhood in our backyards, doing house sweeps. feel like i'm in middle of a movie set. >> residents are trapped. many are terrified. >> my feeling is until this guy is found, i'm just not feeling okay. >> at what would be rush hour, massachusetts governor deval patrick tells boston residents to shelter in place. >> in other words, stay in doors, with their doors locked and not to open the door -- >> it is an unprecedented halt to a city of more than 600,000 peopl